Drier-heating system



AprilA 5,1927.

. wnderwor A. MacKAY DRIER HEATING SYSTEM Flled sept 2e. 1924 .22 or y.

Patented prQES, 17927,.y

` unifi-se stares rif "raar i 'ALFRED MAeKAKoFLPHILADELPHIA, PnNnsYLVANIAf nieren-HEATING `srsrnivt.

` :Application 'led Septemherz, 1924. isenial'fNo. 740,061.

The-presentrinvention'relates to the heatinggot 'drying lmachines tor use in drying i,

continuouslengths otjmaterial, `and more particularly'to the steam heated ,ret-ary driers'zused in the paper making' industry,

Spine .of 'the' objects of the present invention are to prov-ideali improvedheating"sysf @temi t'oi' clriers; "to provide v a hea-ting lsystem wherein the loss'ot heat unitsfis 4reduced to a minimum;'to provide a heating system tor-use with rotating' cylinders whereby the condensation ot steam Within .the .cylinders ies materially reduced; provide :means for ut Jmpg-the heat units of a steamsystem V'tor driers which arev ordinarily `Wasted; to 'pno'viideinelnsfor maintainingV a. relatively small difierenee ofV temperature between ythe- Iinsidel and tilienutside 0f driercylinders; to

invention. Y,

Refer-ringto the drawings, a pluralityot=V drying cylinders 10: are illustrated part of a system tor drying paper, cloth or other material which isted around the heated periphery ot the cylinders as the latterare rotated at a desirable speed, as Well under-y stood in the art. The cylinders l0 are heated by steam supplied by Way'otseparate inlet pipes l1 trom a common header l2 con-y nected to a pipe'l leading' from a source ot live steam. The inlet pipes 1l connect respectively to the cylinders l() by. Way ot the axis ot rotation, for example, by any `well known 'form ot hollow bearings', While the exhaust from the cylinders l() leaves in trie saine manner by discharge pipes 11i as will be understood. Suitable valves 15 lare located respectively in .the inlet pipes llrfor.

control purposes, and like valves 16 are located in the discharge pipes le for a like purpose. Y

For the purpose of providing' .tor a continuous flow of steam through the drier-s or cylinders 10, the discharge pipes le are all` connected to a'conduit 17 leading' to and in communicatlon with the top of a steam separator 18. The steam, air and Water of con- Y-.onevend inl communication;with the :steam :A6

vdrie-rs l0 and-also to utilize approximately,- V,all of the available heat uni-ts of the-- steam;

Y fan' blower or equivalentvmeans in its heat-` .-.ed .condition intothe d-rier'roomfby Waypof densation entering this separator. l'Slareisubjected ato thefusual separatingzgaction settant fthe, avaterf eaves by way ot drainJ piper Q0 leadingto :aftrap 21; Whichi-tnnctions periodicallyfand automatically yto empty fthe'eolf() `i' 4leeted waterinto theretnrn 22 leadinegl/to the -boiler or a hot well as the case may be; l :Theff Y .separated `steam tand" air are tree tol leave the' l separatori 18 byway ot Ia .pipe l23 which has space-ot the separator V18 While yi-tsother end E 'g vleads to a point ot use, as Will-belexplained. f l

In order to reduce condensation invfthe a heatere is provided,'hereehown 4Way* kot .einiinpldI as tormedfotfliollowsections .25 -.k communicating with aA header :26 which re `cei-ve's the-steanr from the vpipe 23. `V The p heater 24e is;- arran-eedtwithin a housing 2-7 75 having` .an inletduct 28 communicating vwith ycold air .supplied bya tan blower-orequiva lent meansl and an outlet-"duct 305 at the oppo-V site side arranged todischargze .the air; a

an .outlet 3l .andzby- Way -otoutletsifdif rectly uponfthe k dryingcylinders 10. lThe header 26 lis provided `With-a .drain/pipe v leadingvto atrap. ,34 which vis-arrangedto periodically r`discharge intof .the return .22 leading to. .fthe boiler. 4A che-ckv alvefis preferably located in the steam pipe 23, and under some conditions it may be advisable to also includea reducing valve 36 in the same 90 pipe 23.- f

ln some instances ther-supply ot separated y steam to the heater 24 may be supplemented by live steam direct trom the original source and to that end a byfpass pipe V37 is con- 95 Ynected between the ,supply pipe 13 and the j pipe Q3 leading to the heater 24. A valve 38 is located in the pip-e 37 tor control purposes, and it necessary a reducing valve 39' may also be placed in this pipe 37. Y

In the operation of the system the drier cylinders 10 are rotatedin the usual manner and the material to be dried is ted about the peripheries of the cylinder in contact with the surfaces heated by the steam sup-- plied to the interiorof the cylinders. The steam enters by the'pipes l1 and discharges by Way of the pipes 14 into Vthe separator 18 where the Water ot condensation drains into loo the trap 21 While the steam passesby Way 110 'sections :25.

"of the :pipe 22 to andl through the heater The V.sections 25 absorb the .K Y residualheat units inthe steam and trans- .fer them-,by radiation `to the incoming cool air which is passing over the outer surfaceV ofthe heater'sections. The air is thus heat- 'ed and leaves by Way of the conduit l30 to be distributed `from the outlets'l and 32 Y ,Y into the dryingroom' and also in such close v yfraise the temperature surrounding the-drier proximity to the driers, as Will eectually Vcylinders and thus reduce tliejcondensation -Well 'as any gas contentfare bloyvn directly and separately throughthe cylinders, and

Ysal

Y of steam Within such cylinders. The Water of condensation'from the heater 24 is conducted-"by the piper33'to the trap 34: and theniperiodical'ly returned to the boiler or 'Whenit becomes necessary tofincrease the g temperature ksurrounding the cylinders, live steam can bedelivered `directly to the heater 24 by utilizing the ley-pass pipe 37 through A opening ofthe valve 38.

It will `Vnovi7 'be'apparent that a complete Y v Thus, in each drying Vcylinder the steam land air, as

all ofthe available'heat units in the'steain are *utilized and there is no loss by beingv carried olf inthe exhaust.

YWhile only asingle form is shownpin whichthis invention'may be embodied, it is Vto 'be understoodfthatrthe invention is not limited to any specific construction, but `might be applied toY various forms Withouty departingv from the spirit of the. invention or the scope of the appended claims.-

" of said cylinders.

Having thus described my invention I claim:

l. In a drier system, the combination of a plurality of drying cylinders, means to Y separately introduce live steam to said cylin-A ders, 'a steam separator .common to `said cylinders and connected to receive exhaust steam therefrom, heater sections in coin-V niunication With said separator to receive n steam therefrom, a housing for said sectionsY vhaving' an inlet for cold airV and an outlet for heatedy air, and meansv for dischargingthe air from saidoutlet about the exterior 2. In a drier system, the combinationof a plurality of drying cylinders, means to i separately introduce live steam to said cyliiiders, a steam separator common to said cylinders and connected to receive exhaust steam therefrom, heater sections in comf niunication with said separator to receive steam therefrom, a housing for said sections having an inlet for cold air and an outlet for heated air, means for discharging the air from said outlet about the exterior of said cylinders7 and means to iiitroducelive steam to said heater sections at" will.

3. In a drier system, the combination of aplurality of drying cylinders, means to separately introduce live steam to said cylinders, a heater unit, means to conduct'exhaust' steam from said cylinders to said heater unit, a housing for said heater unit having an inlet for cold air and an outlet for heated air, and means for discharging the air from said outlet about the exterior of said cylinders.

Signed at Philadelphia, in the county of Philadelphia, and State of Pennsylvania, this 1 1 day of Sept., 1924. l

l ALFRED Marinai?. i 

